Prefers displaying expected values using `#inspect`.

* `#description` is only used for matchers.

[Fixes #260]

Signed-off-by: Andy Lindeman <alindeman@gmail.com>
Signed-off-by: Sam Phippen <samphippen@googlemail.com>
Removes explicit return
Changelog for #260
Merge branch 'issue-260-matcher-description'